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Field dependency between Two fields in Incident form

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chaithanya gund
Tera Contributor

‎03-04-2026 01:33 AM

Hi Team,

 

I have two fields in Incident Form 1. Sub Category (Which is Choice List ) and Service Offering field ( which is a Reference field to Service_offering table where 44 choices are present). 

 

My Requirement is when a Particular Sub category is selected for Ex: Hardware then only Service Offerings related to Hardware should be visible in the Lookup of Service Offering (Ex: 4 Service Offering are related to Hardware) and remaining 40 Choices in table shouldn't be Visible. And in the same way Sub category is selected for Ex: Software then only Service Offerings related to Software should only be visible in the Lookup of Service Offering and other choices should be hidden.

 

How can i Achieve this requirement. Request you to provide your Suggestions.

 

Thank You!

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Dr Atul G- LNG
Tera Patron

‎03-04-2026 05:20 AM

Hi @chaithanya gund 

 

I had a similar use case a few days back, and here’s the approach we used. It’s not very difficult, but I’ll highlight the steps:

Steps Used:

  1. Create BS and SO

    • Establish relationships between them.

  2. Create Category and Sub-Category

    • Use the System Choice Table for this.

  3. Dependency Between BS and SO

    • To manage this, the best approach is to use a User ID Decision Table.

    • Reason: It’s easy to maintain, especially if you plan to add more categories or sub-categories in the future.

  4. Decision Table Setup

    • Decision Table 1: Map SO → Category.

    • Decision Table 2: Map BS → SO → Category → Sub-Category Group.

  5. Form Setup

    • Once the decision tables are in place, you can create a lookup table-like behavior on the form.

  6. Client Script

    • Create a client script to call the decision table(s) on the form.

    • This ensures the selections dynamically follow the mapping logic.

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Regards
Dr. Atul G. - Learn N Grow Together
ServiceNow Techno - Functional Trainer
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AndersBGS
Tera Patron

‎03-04-2026 09:38 AM

Hi @chaithanya gund ,

 

Just to pitch - then why? There is a best practice OOTB in relation to business service and service offering according to CSDM. Why have a dependency towards hardware? I would recommend you to challange the requirement instead of doing this, as I could foresee a rather huge overhead of maintaining this.

 

If my answer has helped with your question, please mark my answer as the accepted solution and give a thumbs up.

Best regards
Anders

Rising star 2024
MVP 2025
linkedIn: https://www.linkedin.com/in/andersskovbjerg/